They threatened staff with what was believed to be a knife and made off with a large quantity of cash. No one was injured.

All four offenders are described as 6ft tall, white men. One of the offenders was white, 6ft tall, wearing blue jumper, light trousers and dark gloves. Another is described as white, 6ft tall and wearing black tracksuit bottoms and trainers.

Detective Constable Adam Lewis from CID at Stoney Stanton Road police station, said: "The incident was very distressing for staff in the bank.

"We are not aware how many people were in the bank at the time. We would appeal for anyone with information, no matter how small, to come forward."

Anyone who witnessed the incident or anyone with information is urged to call CID at Stoney Stanton road police station on 0845 113 5000.